Water tube boiler



June 24, 1930; s, @Q -UUE.; 1,767,173

lwATER TUBE BOILER Filed Mafch 28. i928 .s sheets-sheet 2 kff Jun 24,1930. vs. P. COULTER 13675117.31'-

l WATER TUBE BOILER Filed March 28, 192s s sheets-sheet 3l Patented June24, 1930 UNITED STATES lPara veinen l SAMUEL P. COULTER, MUNCIE, INDIANAWATER TUBE BOILER Application led March 28, 192.8. Serial No. 265,370.

The object of the invention is to provide a boiler of the water tubestyle which is of such a form that it may be constructed in units havinghigh horse-power ratings and practically `wholly of boilersteel so as toavoid the use of brick construction in the insulation thereof; ltoprovide aboiler of this 15 iining the furnace as well as those fordefiecting the exhaust gases in their passage to the smoke-box are ofhollow form and constitute water circulating mediums,

Vith this object in View the invention consists in a construction andcombination of parts of which an acceptable embodiment is described in`the following specification and illustrated in the accompanyingdrawings wherein:

Figure 1 is a central vertical longitudinal sectional view of a boilerconstruction in accordance with the invention.

Figure 2 is a front elevational View.

Figure 3 is a view partly in end elevation and partly in verticalsection of the shell of the boiler, and

Figure 4 is a vertical sectional view of a portion of the shell of theboiler.

The shell 10 which houses the water circulating tubes 11 as well as thefurnace 12 is of U-shaped form, being constructed of boiler sheet shapedto provide a transversely arcuate drum 14 and lateral pendant water ,ylegs 15. The sheets constituting the-shell 49 are united in anyacceptable manner but are shown in the illustrated embodiment asriveted, as indicated at 16, the drum, to preserve its shape underpressure, being stayed as indicated at 17 and the water legs stayed e5as indicated at 17a.

The boiler front, below the drum, is defined by a series of transverseheaders 18 arranged in superposed relation and a furnace door ring 19.The headers and door ring are preferably of cast steel and of hollowforni.` They span the water legs 15 at the front and are incommunication with the latter by means of nipples 20. The door ring` isformed with doorl openings 21 and 22 giving access to the lire-box. andash vpit '55 respectively of the furnace-12.

The tubes 11`connect with the headers 18 and open into the latter andthey likewise connect Vwith and open 'into the headers 23 disposed atthe rear end of the shell but spanning the water legs and beinginteriorly in communication with the latter by means Lof nipples 2li.VThe `headers 23 are identical with the headers 18 and arranged 'in the Ysaine manner but at a lower level than the headers 18 to give vadownward inclination rearwardly to the tubes 11. Thev headers `being ofcross-sectionally vrectangular forni and the tubes beingdisposed at'right angle to the connected walls lof the headers, the

latter are disposed at a slight angle Vto the Yperpendicular 'and thislarrangement disfposes the rear lower edge of'each header below thehorizontal plane of the outer upper edge of the next lower header, thusproviding for an voverlap of the adjacent headers. This arrangementfacilitates the `assembling operation as the headers may be `firstplaced with front walls vertical when there is enough space betweenadjacent :headers to provide formountingjof each one 'withoutinterference from the adjacent one.

After mounting,'the swinging of the head-v ers tothe inclinedpositioiis,'wliich are those that'inust be assumed when the tubes areV 85 installed, brings the walls of adjacent headers'into relatively closearrangement.

The back wall 25 vof the furnace 12 is in the form of a hollow steelcasting spanning the water legs 15 and acting as acirculating 9Gniediuin for the boiler water Vby reason of the Anipple connections 26with the water legs.

preferably brick. A hollow bafile plate 28 spans the water legs 15 justbelow the drum 14, this baffle plate beingdisposed in a vertic'al planeintermediate between the vertical planes'o'f the back wall 25`and therear -end 'im of the shell. It is preferably a hollow steel casting andconstitutes a water circulating medium by reason of its nippleconnections 29 with the water legs 15. A baiile 30 preferably of brickextends from the lower edge of the baiile plate 28 to the bottom row ofthe tubes 11. A

The rear end of the shell below the headers 23 and between the waterlegs 15 is closed with a wall 31 and above the headers is provided witha thimble 32 for connection with the stack to place the smoke-box 33 inconnection with the latter. Y

The fire laid on the grate 34 heats directly the adjacent portions ofthe shell and water circulating parts, the burnt gases arising passingbetween the tubes 11 forward of the baille 27, down between the tubesback of baiile 27, down under the under edge of the baffle and upbetween the tubes into the smoke-box 33 and thence to the stack.

A fusible plug 35 is mounted in the crown sheet 36 just above thefurnace 12.

To give ready access to the tubes 11 both the headers 18 and 23 areprovided with hand openings 37 arranged in axial coincidence with thetubes, each hand hole being inclosed with a removable cover plate notshown.

By reason of the particular form of shell and arrangement of watercirculating tubes in the latter a maximum heating surface is presentedto the action of the heat given off by the furnace, so that for a unitof given dimensions, a maximum amount of water is evaporated resultingin increased steam output, thereby increasing the steam generatingcapacity without increasing the physical dimensions. The particular formof door ring and baille plate add to the steam generating properties andthe form generally makes for the installation without the use ofbrickwork except where it may be desired to use it, instead of metal, ontop of the back wall and below the baifle plate.

From the foregoing description, taken in connection with theaccompanying drawings, it will be noted that lthe headers of eachV setare free of communication and connection with each other, that thehollow front or door ring is free of communication and connection withthe headers, that the back wall is located below the tubes, that thebaffle is located above the tubes, and that the headers, front wall,back wall and baffle are connected to the water legs solely by thenipples which establish communication between said parts, with theresult that any or all of the parts may be easily and quickly removedand replaced.

The invention having been described, what is claimed as new and usefulis:

A steam generator, comprising a drum, water legs co-extensive with thedrum and disposed at opposite sides thereof, front and rear sets ofheaders spanning the water legs, the headers of each set being free ofcommunication and connection with each other, nipples establishingcommunication between the water legs and the ends of the headers andconstituting the sole means for connecting the headers to the waterlegs, one set of headers being disposed at a lower level than the otherset and the headers of both sets beingcross-sectionally angular in formand disposedv at a slight angle tothe perpendicular with the rear loweredge of each header below the horizontal plane of the front upper edgeof the next lower header, tubes connecting the headers, a hollow caststeel front spanning the water legs below the front headers and havingfire and ash door openings and connected to the water legs and free ofcommunication and connection with the headers, a hollow back wallspanning the water legs below the tubes and communicating with the waterlegs, and a hollow baiile spanning the Water legs above the tubes andcommunicating with the water legs.

In testimony whereof he aflixes his signature.

SAMUEL COULTER.

Vas

